CAJ | 학술논문

独山岩体位于河南省南阳市北郊,出露岩石主要以角闪辉长岩为主,中国四大名玉之一的“独山玉”呈透镜体或脉体产在岩体中,并明显受构造裂隙的控制。本文对独山角闪辉长岩进行了系统的岩相学、主元素、微量元素研究。独山角闪辉长岩为亚碱性岩石,低SiO2、高Mg#、贫碱；明显富集大离子亲石元素K、Rb、Sr、Pb,亏损高场强元素Th、Nb、Ta、Zr、Hf,反映源区物质可能受到了流体交代作用。独山角闪辉长岩可能形成于板块汇聚边缘,源区可能为受俯冲流体交代的富集石榴石-尖晶石橄榄岩地幔源区,是其经历1%~3%部分熔融的产物。独山玉可能是富水的独山角闪辉长岩在区域动力变质作用下的产物,在动力变质过程中形成了由重结晶的亚颗粒斜长石和石英及晶形完好的黝帘石组成的透镜体和脉体的独山玉。
독산암체위우하남성남양시북교,출로암석주요이각섬휘장암위주,중국사대명옥지일적“독산옥”정투경체혹맥체산재암체중,병명현수구조렬극적공제。본문대독산각섬휘장암진행료계통적암상학、주원소、미량원소연구。독산각섬휘장암위아감성암석,저SiO2、고Mg#、빈감；명현부집대리자친석원소K、Rb、Sr、Pb,우손고장강원소Th、Nb、Ta、Zr、Hf,반영원구물질가능수도료류체교대작용。독산각섬휘장암가능형성우판괴회취변연,원구가능위수부충류체교대적부집석류석-첨정석감람암지만원구,시기경력1%~3%부분용융적산물。독산옥가능시부수적독산각섬휘장암재구역동력변질작용하적산물,재동력변질과정중형성료유중결정적아과립사장석화석영급정형완호적유렴석조성적투경체화맥체적독산옥。
Dushanmassif, located in the northern suburb of Nanyang City,Henan Province,consists mainly of evjite.As one ofthefourmostfamousyoustones in China,“DushanYu”occurs in form oflenses or veins in themassif,which isapparently under the control of tectonic fracturesin the region. This paperreport results of petrologic,bulk-rock geochemical data for the Dushanevjite. Dushanevjite,mainly sub-alkaline basalts, is characterized by low SiO2, highMg#,andpoor alkaline, but is significantly enriched in large ion lithophile elements (LILEs) like K, Rb, Sr, Pb, depleted in high field strength elements (HFSEs) such as Th, Nb, Ta, Zr, Hf. These results reflect that thesourcesubstance may have beenformed fromfluid metasomatism.Dushanevjite maybeformed at the edge of plate convergence,originated from agarnet-spinel-rich peridotite mantle source undergoing metasomatism of subductingfluid and1%~3% partial melting. DushanYumay beresuled from regional dynamic metamorphismofwater-richevjite, as it occurinforms of lenses and veins,and consists of recrystallized sub-particles plagioclase and quartz andwellcrystallizedzoisite in the process of dynamic metamorphism.